Semeru Volcano evacuations: ash, lahar and loading risks for civil engineers
Reviewed by Joe Ashwell

First reported on Geoengineer.org – News
30 Second Briefing
Mount Semeru in East Java has been raised to the highest alert level after entering a new phase of intense activity, with ash columns reported above several kilometres and villages blanketed in thick deposits. Authorities have ordered mass evacuations from settlements on the volcano’s flanks and along key river valleys that previously channelled lahars in the 2021 eruption. For geotechnical and civil teams, priority issues are ash loading on lightweight roofs, rapid assessment of slope stability on ash-covered road embankments, and lahar risk to bridges and culverts.
Technical Brief
- For similar volcanic corridors, pre-defined lahar channel mapping and bridge vulnerability inventories become critical planning tools.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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